Telephone-exchange system.



6.. L. GOOURUWE. TELEPHGWE EXCHANGE WSJEM.

APPLICATlON HLED FEB. 10, I9.

Piztemedl Jan. 29,1918.

New York, in the county of than sate than GHARLES GQ'U'DRUM, OF NEW YORK, IQ. Y., ASSIGNOR T0 WESTERN ELECTEXG *lllllllll PANY, INCORPORATED, NEW YORK, N. iii, A CORPORATION OF YORK.

TELEPHQNE-EXCHANGE SYSTEM.

pecificaticn of Letters Patent.

Patented. Jan. 153%,

Application filed February 10, 191?. Serial No. 147,802.

To all whom it may concern:

, Be itknown that I, Crnumns L, GooDnUM, a citizen of the United. States, residing at New York and State of New York, have invented certain new and useful linprovements in Telephone- Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to machine switching telephone exchange systems with subscribers control, and has for its object the provision for partial supervision in systems of this character.

In accordance with this invention, a means is associated With the connector, which, when the connector is set, establishes a latent signal for indicating the. number of the called line. If the connector operations do notproceed in the normal manner, an annunciator is displayed before the operator. 'llhe operator may then operate a manual switching device which causes the display of this latent signal, thusindicating to her the number of the line upon which the connector has been set. The operation of the manual switching 'dcvice. may also serve to connect her head-set to the-calling line; whereby she can communicate with the calling party.

Referring to the d-awing-, the invention will be more readily understood from a detailed description of the operation.

Upon the removal of the receiver is the calling party at substation A, a line hndcr diagrammatically indicated at 1, extends such line to the selector diagrammatically indicated at 2. The calling party then operates the sender S to set the selector in operative relation to the desired group of trunks terminating in connectors, whereupon an idle one of these trunks is automatically seized in the well-known manner. Upon the extension of the calling line to the con hector, the following circuit is closed: free pole to battery relay 3, brush 4', terminal. 5, substation A, terminal 6, brush 7, brush 8,

terminal 9, conductor 10, relay 11 to ground.

Relay ll, in operating, energizes slow relay- 12 which, in attracting its left, armature interposes a break in the circuit of the release magnet 13, and in attracting its right armature, connects the back contact of the stepping relay 11 to the rotary stepping magnet 14 0f the connector.

The calling party now operates his sender S to transmit the tens digit of the Wanted number. Upon each retraction of thearma ture of relay 11 an impulse is transmitted 'over the following circuit to magnet 14:,

ground: armatureand back contact of relay 11, right armature and front contact of re lay 12, conductor 15, outer right armature and back contact of relay 16, connector side switch arm 17 magnet 14 to tree pole of battery. The magnet 14:, responding; to these till impulses, steps the shaft 21 around so as to bring one of the sets of brushes 24:, into I operative relation with the contacts 25, 46. Upon the first retraction of the armature of relay 11, a slow relay 18 is energized. This relay, in attracting its inner right armature,

energizes the escape magnet 19 of the side switch of the connector. When the sender reaches lts normal position and maintains stepping relay 11 energized, relay 18, after i an interval, retracts its armature, thus-dcenergizingthe escape magnet which passes the slde switch to position 2. In this os1-- tion vertical stepping magnet 20 is so. sti-' tuted in the stepping circuit for rotary magnet 14,. The calling party now operates his sender S in transmitting; the units digit of the called number. Upon each retraction of the armature of relay 11 an impulse is trans: mitted to magnet 20 which drives the selected brushes 24: over the selected group. Upon the first retraction of the armature of relay 11, slow relay 18 is again energized and en ergizes the escape magnet 19, as before. in position 2 side-switch arm 23 connects test relay 16 to the connector brush 24. Assam ing now that the called line islousy, battery potential will be found upon its test termin-a1, as will hereinafter appear. When, therefore, the brush 24 reaches the terminal 25 of the selected line, and before the escape till:-

magnet 19 retracts its armature, but afterrelay 18 has retracted its armatnres, the fol relay 16, left armature an contact 28 thereof, conductors 29, 30, left armature and llllllll' act traction of this armature also closes a circuit for the escape magnet .19 to hold the same energized in order to prevent the side switch from going into the ringing position: free pole of battery, magnet 19, arm 33 and its second contact, conductor 34, contacts 35, 28 of relay 16, conductors 29, 30, left armature and front contact of relay 12 to ground. In attracting its outer right armature relay 1G disconnects the magnet 20 from the back contact of relay 11, thus preventing further impulses from being transmitted to this niagnet,and in attracting its inner right armature connects a source of busy tone current 68 to the uppertalking conductor and thence to the calling line to indicate to the calling. party that the desired line is busy. Upon the replacement of the receiver by such party. relays 11 and 12 are deenergized, which results in the closure of a circuit for the release magnet 13 of the connector as follows: free pole of battery, magnet 13, primary elf-normal contact PON, right armature and contact of relay 31, conductor 32, left armature and back contact of relay 12 to ground.

If the desired line had been idle no potential being found on the contact 25, the circuit traced for relay 16 would not have been completed, and the side switch would have advanced into the ringing position upon the dcenergization of slow relay 13 at the end of the units iu'ipulses. Arm in position 3 closes a circuit for relay 40 and the cut off relay of the called line. The potential thus appliedto multiples 25 causes this line to test busy to other connectors. Relay 40 closes the ringing circuit as follows: Pole of ringing generator 37, ringing cut-0H relay 33, conductor, 39. armature and front contact of relay 40, conductors 41, 42, arm 43, conductor 44, brush 4:), terminal 46, line conductor 47. through the signaling apparatus at substation li, line conductor 48, ter. minal 25, brush 24-, conductor '9, arm 23 a .d its third contact through relay 40 to battery and ground. In position 3 arm 33 closes a circuit for the escape magnet 19 as follows: Free pole of battery. magnet 1!), arm 33 and its third contact. armature and back contact of relay 38, conductor 30, left armature and front contact of relay 12 to ground. Upon the removal of the receiver by the party at substation B the relay 38 becomes energized, opening the circuit of magnet 19 which passes the side switch into position 4, in which position talking current is fed to the called line over the following circuit: free pole of battery, magnet 40, arm 23 and its fourth contact, conductor 49, brush 24, multiple 25, line conductor 48, through the telephonic apparatus at substation B, conductor 47, multiple 46, brush 45, conductor 44, arm 43 and its fourth contact, conductors 50, 51,

front contact of relay 12 to ground. The atrelay 31 to ground. Upon the conclusion of the conversation and the replacement of the receivers the release circuit. is closed as follows: free pole of battery, magnet 13, contact PON, right armature and back contact of relay 31, left armature and back contact of relay 12 to ground.

The connector brush shaft 21 carries, in addition to the regular brushes 24, 45, a brush 58 and a set of contacts 59 to be engaged thereby. This brush rotates with the shaft when it is being set by the rotary magnet 14. \Vhen, however, the shaft is elevated by the magnet 20, the shaft is free to move independently of the brush 58 by reason of the key and slot construction shown. The shaft is also provided with a brush (it) which engages a set of terminals ()1 during the upward movement of the shaft. This brush (30 is so mounted on the shaft 21 that the shaft is free to rotate independently of the brush but carries the brush in its vertical movement. Connected to each contact of the group of contacts (ll is a lamp and to each of the contacts of the group of contacts 59 a lamp ('33 is connected.

Thus, when the connector is set, the brushes 60 and 58 are in engagement with terminals of lamps corresponding to the tens and units digits of the called line. in position 2 and in position 3 of the connec tor side switch a circuit for a relay 5) is closed as follows: free pole of battery, resistance 53, relay 52, arm 54 and its second contact, contact 80 closed on the first rotary step of the connector shaft, to ground, or

arm 54 and its third contact directly to ground. This relay is constructed so as not to attract its armature until after an interval of time longer than that which usuaily occurs between the first vertical step of the shaft 61 and the rcmoral of the receiver by the called party, which results in the side switch passing out of the third or ringing p sition and the opening of the circuit for relay 52 just traced. If, however, this interval of time is exceeded, the relay attracts its armature and lights the lamp 55. The operator then inserts plug .76 into jack 57. This results in the illun'iination of one of the lens and one of the units lamps (32, G3, to indicate to the operator the munbcr being called. The circuit for the lamp of group 2 is as follows: free pole of battery, lamp 62, termimfl (31, brush 60, conductor 64, contacts 65, (36. to ground. The circuit for the lamp of group 63 is as follows: free pole of battery, lamp 63, contact 59, brush 58, conductor 69, contacts 67, 65, 66 to ground. The closure of contact 66 also shunts out the relay 52 which thereupon detinergizes, extinguishing lamp 55. The operator can now, by means of her head-set H, communicate with the calling party.

- belongs, and the thousands i practice would connectors, the

masses The tens and units digits of the called line are indicated to the operator by the lighted lamps 63, 62, respectively The hundreds. digit would be indicated to her by the position the lamp 55' and its associated jack 5'? occupy in. the bank of similar lamps and jacks of the other connectors serving the thousand to which the called number digit by the par ticular bank in which the lamp 55 is located.

The lamps 62, 63, however, may and in be common to a number of terminals 59 and (51 being such connectors.

multipled at 55 will also be lighted it the The lamp Call 11% party, upon receiving the busy signal, oes not immediately replace 1115 reowner.

The operator may then communicate with the calling party and inform him that the line desired is busy.

What is claimed is: v

1. In a telephone exchange system, the combination with telephone lines, means ineluding connector switches for interconnecting saidlines, means associated with said connectors for designating the line upon which a connector is set, said means being prepared for actuation upon the setting of the connector, and manual means for actuating said designating means.

2. In a telephone exchange system, combination with telephone lines, means ineluding connector switches for interconnectlatent visual signal for indicating the called line established by the setting of'the connectoron such line, and

manual ineans for means.

In a. telephone exchange system, the combination with telephone lines, nieans'ineluding connector switches for interconnecting said lines, a latent visual signal assodisplaying said indicating .ciated with said connectors for designating the line upon which a connector is set, said signal being established upon the setting of the connector, an annunciator for each con nector, means for operating the same, an operators telephone set, and manual means for connecting said set to the calling line and for displaying said signal.

4:. In a telephone exchange system, the combination with telephone lines, means including connector switches for interconnecting said lines, banks of lamps for indicating the combination with telephone lines,-means ining said lines,

shaft and the tens and units digits ol the called nnm ber, switching means associated with the connector for preparing circuits for a lamp of each group when said connector is set, and manual means for completing said circuits.

5. In a telephone exchange system, the combination with telephone lines, means including connector switches for intercom necting said lines, a source of signaling can rent, means for applying such source to the selected line, means associated with said connectors for designating the lines upon which a connector is set, said means being prepared for actuation upon the setting of the connector, an annunciator for each connector, a circuit for operating said annunciator, means for closing the same it said source is connected. to the called line longer than a predetermined interval, and manual means for actuating said indicating means.

6-. In a telephone exchange system, the combination with telephone lines, means in cluding connector switches for interconnect-- ing said lines, banks of lamps for indicating the tens and units digits of the called numher, a pair bf brushes mounted on the connector shaft for preparing circuits for a lamp of each group when said connector is set, and connector for completing such circuits.

7. In a telephone exchange system, the

eluding connector switches for interconnectsaid connector switches having a rotary and a vertical movement, banks of lamps for indicating the tens and. units, digits of the called line, two groupeot terminals on the connecto .ifor said lamp groups, a brush mova ing the rotary movement thereod to prepare a circuit for one of the-lamps of the tens group, said brush being free to rotate with manual means associated with said ble with the shaft dun said shaft but being prevented from being elevated therewith, a second brush on said shaft for engagement with the terminals of the units group of lamps said brush partaking only of the vertical movement oztthe preparing a circuit for a units lamp when the connector is set, and manual means for completing said circuits,

In witnem whereof, l1 hereunto subscribe my name this 9th day of February, A. D.-

GHABLES L. GOODRUM' 

